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Time-frequency analysis of THz-time domain spectroscopy data
Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Division of Systems and Control. Department of Electronic Systems, Faculty of Information Technology and Electrical Engineering, NTNU.
2018 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

This text investigates THz-TDS signals in the time-frequency domain. Addi- tionally this text discusses the prospects of using time-frequency analysis to alleviate distortion in THz spectrographic characterizations induced by back- reflections in the free space electro optic sampling used in the THz time-domain spectroscopy detection scheme. THz time domain spectroscopy is a technique for characterization of materials in the terahertz regime. The THz regime offers interesting properties of materials such as strong phonon-photon interaction and resonances for vibration states of molecules. Three time-frequency representations are compared for the analysis of the time-domain signal, the short-time Fourier transform, the Wigner-Ville transform and the continuous wavelet transform. It is concluded that the Wigner-Ville transform is most suited for analysis of the spectral properties of a single pulse due to the Wigner-Ville transforms inherit high spectral resolution. The continuous wavelet transform is most suited for analysis of the time-domain signal since it has no cross-term interference as compared to the Wigner-Ville transform. By masking the continuous wavelet transform with a Lorentzian time-frequency mask the back-reflections are dampened and the resolution of the characterization is improved.

Place, publisher, year, edition, pages
2018. , p. 84
Series
UPTEC F, ISSN 1401-5757 ; 18037
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:uu:diva-357416OAI: oai:DiVA.org:uu-357416DiVA, id: diva2:1239318
Educational program
Master Programme in Engineering Physics
Supervisors
Examiners
Available from: 2018-08-21 Created: 2018-08-16 Last updated: 2018-08-21Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • ieee
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Output format
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